The government said it wanted the Bush administration to explain why it canceled the visa of a close ally of President Evo Morales, Senator Leonilda Zurita, who was planning to travel to the United States for a speaking tour. Ms. Zurita has led rallies with chants of "Long live coca!" and "Death to the Yankees!" The State Department said her visa was revoked two years ago but gave no reason. JUAN FORERO (NYT)